Ibicui Comb rat

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Ibicui Comb rat
Systematics
Subordination : Porcupine relatives (Hystricomorpha)
Partial order : Hystricognathi
without rank: Guinea Pig Relatives (Caviomorpha)
Family : Comb rats (Ctenomyidae)
Genre : Comb rats ( Ctenomys )
Type : Ibicui Comb rat
Scientific name
Ctenomys ibicuiensis
Freitas , Fernandes , Fornel & Roratto , 2012

The Ibicui comb rat ( Ctenomys ibicuiensis ) is a type of comb rats . The species is endemic in the southwest of the state of Rio Grande do Sul in Brazil , where it has only been found in six localities.

features

The Ibicui comb rat reaches an average total length of 23.4 centimeters with an average tail length of 7.5 centimeters and a weight of about 200 grams. The rear foot length is 37 millimeters with the claw, 34 millimeters without the claw. It is a comparatively small species of the genus. The back color is evenly light brown. The ventral side is lighter brown.

The karyotype consists of a double set of 2n = 50 chromosomes with 10 telocentric and 14 acrocentric chromosome pairs (FN = 68) chromosomes. The sperm are symmetrical.

distribution

The distribution area of ​​the Ibicui crested rat is limited to the south of Brazil , where the species is endemic and has only been recorded in the southwest of the state of Rio Grande do Sul in Manoel Viana and Maçambara . The altitude distribution is around 90 to 200 meters.

Way of life

There is hardly any information about the way of life of the species. Like all comb rats, it lives largely underground in duct systems and feeds on the available vegetation, especially grass and leaves, as a vegetarian diet. As a habitat, it uses open sandy areas and grasslands along and between forest areas. The animals are loners (solitary); There is no information available on reproduction.

Systematics

The Ibicui Crest rat as independent way within the genus of the comb rats ( Ctenomys belongs), which consists of about 70 species. The first scientific description of the species comes from a working group led by the Brazilian zoologist Thales RO de Freitas in 2012, who described it using individuals from the four known localities from the state of Rio Grande do Sul . Based on molecular biological data, it is assigned to the torquatus group around the collar-comb rat ( Ctenomys torquatus ).

Apart from the nominate form, no subspecies are distinguished within the species .

The species was named after the Ibicuí river , which flows close to where the animals were found. In the Tupi-Guarani language, the word "ibicuí" also means sand dunes , which means that it corresponds to the habitat of the animals.

Status, threat and protection

The Ibicui crested rat is not classified in a hazard category by the International Union for Conservation of Nature and Natural Resources (IUCN) due to the scarcely available data on the way of life and the population size, but rather listed as "data deficient". It is regionally limited by its habitat preferences and distribution and is threatened in its entire distribution area by agriculture, silviculture and desertification and thus by fragmentation and habitat loss.

supporting documents

  1. ↑ a b c d e f g h i j Ibicui Tuco-tuco. In: TRO Freitas: Family Ctenomyidae. In: Don E. Wilson, TE Lacher, Jr., Russell A. Mittermeier (Eds.): Handbook of the Mammals of the World: Lagomorphs and Rodents 1. (HMW, Volume 6) Lynx Edicions, Barcelona 2016, ISBN 978- 84-941892-3-4 , p. 521.
  2. ↑ a b c Ctenomys ibicuiensis in the endangered Red List species the IUCN 2019. Posted by: P. Engelbrektsson, 2016. Accessed April 20, 2020th
  3. ↑ a b Thales RO de Freitas, Fabiano A. Fernandes, Rodrigo Fornel, Paula A. Roratto: An endemic new species of tuco-tuco, genus Ctenomys (Rodentia: Ctenomyidae), with a restricted geographic distribution in southern Brazil. Journal of Mammalogy, 93 (5), 2012, pp. 1355-1367. doi: 10.1644 / 12-MAMM-A-007.1

literature

  • Ibicui Tuco-tuco. In: TRO Freitas: Family Ctenomyidae. In: Don E. Wilson, TE Lacher, Jr., Russell A. Mittermeier (Eds.): Handbook of the Mammals of the World: Lagomorphs and Rodents 1. (HMW, Volume 6) Lynx Edicions, Barcelona 2016, ISBN 978- 84-941892-3-4 , p. 521.
  • Thales RO de Freitas, Fabiano A. Fernandes, Rodrigo Fornel, Paula A, Roratto: An endemic new species of tuco-tuco, genus Ctenomys (Rodentia: Ctenomyidae), with a restricted geographic distribution in southern Brazil. Journal of Mammalogy, 93 (5), 2012, pp. 1355-1367.

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